Tiger Woods lines up a putt on the third hole during the third round of the Northwestern Mutual World Challenge golf tournament at Sherwood Country Club, Saturday December 7, 2013, in Thousand Oaks, Calif. (Andy Holzman/Los Angeles Daily News)

Tiger Woods hits a shot from the fairway during the third round of the Northwestern Mutual World Challenge golf tournament at Sherwood Country Club, Saturday December 7, 2013, in Thousand Oaks, Calif. (Andy Holzman/Los Angeles Daily News)

THOUSAND OAKS >> Tiger Woods won’t be using his lifetime exemption at the Masters to play into his old age, unless he thinks he still can win.

Woods always has contended he enters events only if he thinks he can win. His philosophy on that hasn’t changed, even for majors.

“I always want to win, so if I can’t win why tee it up?” Woods said Saturday at Sherwood Country Club, site of his Northwestern Mutual World Challenge. “That’s just my own personal belief. And I know what it takes to prepare to win and what it takes to go out there and get the job done.

“There’s going to come a point and time where I just can’t do it anymore. We all as athletes face that moment. I’m a ways away from that moment in my sport, but when that day happens I’ll make a decision and that’s it.”

Woods, 37, pressed on whether he might change his mind as he got older, didn’t bite.

“Considering Tom (Watson) almost won the British Open at age 59, Sam (Snead) winning at (age 52 in 1965) at Greensboro, we can play for a long period of time,” Woods said. “You’ve seen so many guys as of late ... Fred Funk, Jay Haas, Raymond Floyd, Fred (Couples) do well in their late 40’s and 50’s. Every other sport you’re done at my age or younger.

“Guys have proven it. I think that’s probably the more difficult thing, that you can still finish top 10, top fives, but you’re probably not quite as efficient as you need to be to win golf tournaments.”

Memories

Tiger Woods used to attend Sherwood when Greg Norman hosted the Shark Shootout here. Woods later started his own event when Norman stopped hosting. This is his final year of the tournament at Sherwood since he’s moving it to Florida.

“I’ve played here (outside tournaments) and I remember coming to the Shark Shootout in the days Butch (Harmon) was working with Greg,” Woods said. “I was young and working with Greg and I’d just started to work with Butch and I would come out here and the guys would tee off and Butch would help me out for about an hour on the range and get a little work in.”

Celebrity corner

Former UCLA basketball coach Jim Harrick attended Saturday’s round as did comedian Jon Lovitz. Harrick attends the Masters each year as well.